No idea what these were used for but I have been storing camping gear and other items in a few of these. They are very strong but lightweight. Split in the middle and some have a shelf that seperates the 2 pieces for storage of small items. I thought they might be nice for putting recovery gear, gas and oil cans, etc in so that all you would have to do is throw the whole thing in when you went for a weekend.

There are 8 adjustable cam over latches and 2 handles on each of the 2 pieces for carrying. There is a rubber seal between the 2 halves and a pressure release valve on one end.